netdev - Re: [PATCH v8 bpf-next 02/14] xdp: add xdp_shared

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Date:   Thu, 8 Apr 2021 16:26:43 +0200
From:   Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Lorenzo Bianconi <lorenzo@...nel.org>, bpf@...r.kernel.org,
        netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        ast@...nel.org, daniel@...earbox.net, shayagr@...zon.com,
        sameehj@...zon.com, john.fastabend@...il.com, dsahern@...nel.org,
        brouer@...hat.com, echaudro@...hat.com, jasowang@...hat.com,
        alexander.duyck@...il.com, saeed@...nel.org,
        maciej.fijalkowski@...el.com
Subject: Re: [PATCH v8 bpf-next 02/14] xdp: add xdp_shared_info data structure

> Hi Lorenzo,
> 
> On Thu, Apr 08, 2021 at 02:50:54PM +0200, Lorenzo Bianconi wrote:
> > Introduce xdp_shared_info data structure to contain info about
> > "non-linear" xdp frame. xdp_shared_info will alias skb_shared_info
> > allowing to keep most of the frags in the same cache-line.
> > Introduce some xdp_shared_info helpers aligned to skb_frag* ones
> > 
> > Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> > ---
> 
> Would you mind updating all drivers that use skb_shared_info, such as
> enetc, and not just mvneta? At the moment I get some build warnings:
> 
> drivers/net/ethernet/freescale/enetc/enetc.c: In function ‘enetc_xdp_frame_to_xdp_tx_swbd’:
> drivers/net/ethernet/freescale/enetc/enetc.c:888:9: error: assignment to ‘struct skb_shared_info *’ from incompatible pointer type ‘struct xdp_shared_info *’ [-Werror=incompatible-pointer-types]
>   888 |  shinfo = xdp_get_shared_info_from_frame(xdp_frame);
>       |         ^
> drivers/net/ethernet/freescale/enetc/enetc.c: In function ‘enetc_map_rx_buff_to_xdp’:
> drivers/net/ethernet/freescale/enetc/enetc.c:975:9: error: assignment to ‘struct skb_shared_info *’ from incompatible pointer type ‘struct xdp_shared_info *’ [-Werror=incompatible-pointer-types]
>   975 |  shinfo = xdp_get_shared_info_from_buff(xdp_buff);
>       |         ^
> drivers/net/ethernet/freescale/enetc/enetc.c: In function ‘enetc_add_rx_buff_to_xdp’:
> drivers/net/ethernet/freescale/enetc/enetc.c:982:35: error: initialization of ‘struct skb_shared_info *’ from incompatible pointer type ‘struct xdp_shared_info *’ [-Werror=incompatible-pointer-types]
>   982 |  struct skb_shared_info *shinfo = xdp_get_shared_info_from_buff(xdp_buff);
>       |                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 

Hi Vladimir,

Ack, I will fix it in v9; enetc was not compiled on my machine, thanks for pointing
this out :)

Regards,
Lorenzo

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